All you have to do to find the volume of a swimming pool is multiply the length x width x average depth x gallons in a cubic foot (7.48). In your case it would be 38x22x5.5x7.48=34,393 gallons.

Assuming the change in depth is along the 32 foot length, the slope is at a constant angle and it were filled to the brim it would hold 21065 US gallons of water.

Here's a formula for round pools: distance across*distance across*depth*5.9 for rectangles: length*width*depth*7.5 or for a deep end: length*width*((shallow end depth + deep end depth)/2)*7.5 so in your case, 24*24*4.3*5.9=15000 gallons

It is hard to say because ponds have varying depths. However, if the depth is uniformly 18 inches deep across the whole five acres, the pond would hold about 2,443,886 gallons of water.